A new project seeks to kick-start a revival for the world’s largest rainforest by planting tens of millions of trees.

The project, announced in September at the “Rock in Rio” music fest in Brazil, aims to restore 73 million trees in the Brazilian Amazon by 2023. Spanning 30,000 hectares of land (about 74,000 acres), the project is the largest tropical forest restoration in the world and helps Brazil move towards its Paris Agreement target of reforesting 12 million hectares of land by 2030.